package com.david.mydemo.ctl_commons;


import com.david.mydemo.framework.annotation.MySysLog;
import com.david.mydemo.util.MyConstants;
import com.david.mydemo.util.MyResponse;
import com.david.mydemo.util.StringUtils;
import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;

/**
 * 图片验证码（支持算术形式）
 *
 * @author My
 */
@Slf4j
@Controller
@RequestMapping("/captcha")
@Api(tags = "图片验证码")
public class SysCaptchaController {

    @Resource(name = "captchaProducer")
    private Producer captchaProducer;

    @Resource(name = "captchaProducerMath")
    private Producer captchaProducerMath;

    /**
     * 验证码生成
     */
    @MySysLog(operate = MyConstants.OPERATE_GET, content = "获取验证码", module = MyConstants.MODULE_LOGIN)
    @GetMapping(value = "/getCaptchaImage")
    public void getCaptchaImage(HttpServletRequest request, HttpServletResponse response) {
        log.info("获取验证码图片数据。");
        ServletOutputStream out = null;
        try {
            String type = request.getParameter("type");
            if (StringUtils.isEmpty(type)) {
                type = "char";
            }
            String capStr = null;
            String code = null;
            BufferedImage bi = null;
            if ("math".equals(type)) {
                String capText = captchaProducerMath.createText();
                capStr = capText.substring(0, capText.lastIndexOf("@"));
                code = capText.substring(capText.lastIndexOf("@") + 1);
                bi = captchaProducerMath.createImage(capStr);
            } else if ("char".equals(type)) {
                capStr = code = captchaProducer.createText();
                bi = captchaProducer.createImage(capStr);
            }
            request.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY, code);
            // 设置响应参数
            response.setDateHeader("Expires", 0);
            response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
            response.addHeader("Cache-Control", "post-check=0, pre-check=0");
            response.setHeader("Pragma", "no-cache");
            response.setContentType("image/jpeg");
            out = response.getOutputStream();
            ImageIO.write(bi, "jpg", out);
            out.flush();
        } catch (Exception e) {
            log.error("生成验证码报错，异常信息：", e);
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
            } catch (IOException e) {
                log.error("生成验证码，关闭文件流报错，异常信息：", e);
            }
        }
    }

    @MySysLog(operate = MyConstants.OPERATE_GET, content = "获取验证码数值", module = MyConstants.MODULE_LOGIN)
    @GetMapping(value = "/getCaptchaCode")
    @ApiOperation(value = "getCaptchaCode", response = String.class)
    @ResponseBody
    public MyResponse getCaptchaCode() {
        HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
        Object attribute = request.getSession().getAttribute(Constants.KAPTCHA_SESSION_KEY);
        return new MyResponse().success(attribute);
    }

}
